Pink Floyd´s "Shine On You Crazy Diamond" is dedicated to the band´s former leader Syd Barret. Syd used to be the leader...until his schizophrenia and the LSD started to catch up with him, and he became rather insane. The band called David Gilmour, who had given Syd guitar lessons during high shool, and would cover for Syd during concerts, correcting his mistakes and filling in when he started playing along to a different tune. Syd eventually got more and more distanced of the band and David got to be the lead guitarist, but lots of the insanity themes they sing about is related to their former bandmate.